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Extensible validation for Python dictionaries.
This module implements Cerberus Validator class
:copyright: 2012-2016 by Nicola Iarocci.
:license: ISC, see LICENSE for more details.
Full documentation is available at http://python-cerberus.org
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Raised when a schema (list) validation encounters a mapping.
Not supposed to be used outside this module.
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BareValidatora�
Validator class. Normalizes and/or validates any mapping against a
validation-schema which is provided as an argument at class instantiation
or upon calling the :meth:`~cerberus.Validator.validate`,
:meth:`~cerberus.Validator.validated` or
:meth:`~cerberus.Validator.normalized` method. An instance itself is
callable and executes a validation.
All instantiation parameters are optional.
There are the introspective properties :attr:`types`, :attr:`validators`,
:attr:`coercers`, :attr:`default_setters`, :attr:`rules`,
:attr:`normalization_rules` and :attr:`validation_rules`.
The attributes reflecting the available rules are assembled considering
constraints that are defined in the docstrings of rules' methods and is
effectively used as validation schema for :attr:`schema`.
:param schema: See :attr:`~cerberus.Validator.schema`.
Defaults to :obj:`None`.
:type schema: any :term:`mapping`
:param ignore_none_values: See :attr:`~cerberus.Validator.ignore_none_values`.
Defaults to ``False``.
:type ignore_none_values: :class:`bool`
:param allow_unknown: See :attr:`~cerberus.Validator.allow_unknown`.
Defaults to ``False``.
:type allow_unknown: :class:`bool` or any :term:`mapping`
:param require_all: See :attr:`~cerberus.Validator.require_all`.
Defaults to ``False``.
:type require_all: :class:`bool`
:param purge_unknown: See :attr:`~cerberus.Validator.purge_unknown`.
Defaults to to ``False``.
:type purge_unknown: :class:`bool`
:param purge_readonly: Removes all fields that are defined as ``readonly`` in the
normalization phase.
:type purge_readonly: :class:`bool`
:param error_handler: The error handler that formats the result of
:attr:`~cerberus.Validator.errors`.
When given as two-value tuple with an error-handler
class and a dictionary, the latter is passed to the
initialization of the error handler.
Default: :class:`~cerberus.errors.BasicErrorHandler`.
:type error_handler: class or instance based on
:class:`~cerberus.errors.BaseErrorHandler` or
:class:`tuple`
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The arguments will be treated as with this signature:
__init__(self, schema=None, ignore_none_values=False,
allow_unknown=False, require_all=False,
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error_handler=errors.BasicErrorHandler)
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Creates and adds one or multiple errors.
:param args: Accepts different argument's signatures.
*1. Bulk addition of errors:*
- :term:`iterable` of
:class:`~cerberus.errors.ValidationError`-instances
The errors will be added to
:attr:`~cerberus.Validator._errors`.
*2. Custom error:*
- the invalid field's name
- the error message
A custom error containing the message will be created and
added to :attr:`~cerberus.Validator._errors`.
There will however be fewer information contained in the
error (no reference to the violated rule and its
constraint).
*3. Defined error:*
- the invalid field's name
- the error-reference, see :mod:`cerberus.errors`
- arbitrary, supplemental information about the error
A :class:`~cerberus.errors.ValidationError` instance will
be created and added to
:attr:`~cerberus.Validator._errors`.
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Creates a new instance of Validator-(sub-)class. All initial parameters of the
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explicit *keyword*-parameter.
:param document_crumb: Extends the
:attr:`~cerberus.Validator.document_path`
of the child-validator.
:type document_crumb: :class:`tuple` or :term:`hashable`
:param schema_crumb: Extends the
:attr:`~cerberus.Validator.schema_path`
of the child-validator.
:type schema_crumb: :class:`tuple` or hashable
:param kwargs: Overriding keyword-arguments for initialization.
:type kwargs: :class:`dict`
:return: an instance of ``self.__class__``
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Removes nodes by index from an errorpath, relatively to the basepaths of self.
:param errors: A list of :class:`errors.ValidationError` instances.
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the :attr:`document_path`.
:param sp_items: Alike ``dp_items``, but for :attr:`schema_path`.
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Searches for a field as defined by path. This method is used by the
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:param path: Path elements are separated by a ``.``. A leading ``^``
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otherwise it relates to the currently evaluated document,
which is possibly a subdocument.
The sequence ``^^`` at the start will be interpreted as a
literal ``^``.
:type path: :class:`str`
:returns: Either the found field name and its value or :obj:`None` for
both.
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If ``True`` unknown fields that are not defined in the schema will be ignored.
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validated against its rules. Also see :ref:`allowing-the-unknown`.
Type: :class:`bool` or any :term:`mapping`
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Whether to not process :obj:`None`-values in a document or not.
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The :attr:`~cerberus.Validator.allow_unknown` attribute of the first level
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The registry that holds referenced rules sets.
Type: :class:`~cerberus.Registry`
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The constraints that can be used for the 'type' rule.
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provided here, the schema must have been provided at
class instantiation.
:type schema: any :term:`mapping`
:param always_return_document: Return the document, even if an error
occurred. Defaults to: ``False``.
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